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Title: On the Ia - S relation of the SCS-CN method
Authors: Jain, Manoj Kumar
Mishra, Surendra Kumar
Babu P.S.
Venugopal K.
Published in: Nordic Hydrology
Abstract: The initial abstraction (/a) versus maximum potential retention (S) relation in these Soil Conservation Service Curve Number (SCS-CN) methodology was revisited, and a new non-linear relation incorporating storm rainfall (P) and S was proposed and tested on a large set of storm rainfall-runoff events derived from the water database of United States Department of Agriculture-Agriculture Research Service (USDA-ARS). Employing root mean square error (RMSE), the performance of both the existing and proposed models was evaluated using the complete database, and for model calibration and validation, data were split into two groups: based on ordered rainfall (P-based) and runoff (Q-based). A specific formulation of the proposed model /a = λAS(P/(P + S))α with λ = 0.3 and α = 1.5 was found to generally perform better than the existing /a = 0.2S, and therefore was recommended for field applications. When evaluated using the observed /a data, the proposed version performed significantly better than the existing one. © IWA Publishing 2006.
Citation: Nordic Hydrology (2006), 37(3): 261-275
Issue Date: 2006
Keywords: Agriculture Research Service
Curve number
Initial abstraction
Rainfall-runoff modelling
SCS-CN method
ISSN: 291277
Author Scopus IDs: 55555537300
Author Affiliations: Jain, M.K., National Institute of Hydrology, Roorkee-247 667 UA, India
Mishra, S.K., Indian Institute of Technology, Roorkee-247 667 UA, India
Babu, P.S., Institute of Remote Sensing, Anna University, Chennai-600 025, India
Venugopal, K., Institute of Remote Sensing, Anna University, Chennai-600 025, India
Corresponding Author: Jain, M.K.; National Institute of Hydrology, Roorkee-247 667 UA, India; email:
Appears in Collections:Journal Publications [WR]

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